The Megger DLRO 200 is an industry-leading, heavy-duty digital low resistance ohmmeter designed specifically for high-voltage substations, power utilities, and heavy industrial maintenance. Finding subtle contact degradation before it leads to catastrophic equipment failure requires power, precision, and reliable field equipment.

By delivering adjustable, high-purity DC test currents from 10 A to 200 A, the Megger DLRO 200 accurately measures micro-ohm resistance across circuit breaker contacts, busbar joints, switchgear connections, and high-power electrical bonding. It effectively breaks through surface oxides and contaminants to reflect true conductor health under actual operating conditions.

Why Choose the Megger DLRO 200?

1. High-Current Performance for Demanding Diagnostics

Standard multimeters and lower-current ohmmeters simply cannot expose high-resistance joints under real-world load conditions. The Megger DLRO 200 outputs true DC test currents up to 200 Amps, ensuring you detect high-resistance points, loose bolting, or thermal stress before they cause unscheduled downtime or safety hazards.

2. Precise 4-Terminal Kelvin Measurement

Built around the trusted 4-wire Kelvin measurement method, the Megger DLRO 200 completely eliminates test lead resistance and contact resistance errors from your readings. This guarantees pinpoint accuracy across a broad measuring range of 0.1 µΩ to 999.9 mΩ, delivering consistent, verifiable results every time.

3. Multiple Flexible Test Modes

To streamline field operations and increase safety, the instrument features three versatile test modes:

• Manual Mode: Ideal for standard, one-off contact resistance checks.

• Auto Mode: Automatically initiates test current as soon as the potential leads touch the test specimen—perfect for fast, repetitive measurements without needing extra hands.

• Continuous Mode: Allows continuous monitoring of dynamic resistance over time, capable of maintaining a 200 A output for extended periods without overheating.

4. Onboard Data Logging & Instant PC Export

Managing compliance records and predictive maintenance logs is effortless. The Megger DLRO 200 features built-in internal memory capable of storing up to 300 test results, complete with custom alphanumeric tagging for precise location or breaker identification. Export your records seamlessly via the RS232 serial port to generate professional audit reports and asset health trends.

5. Built Tough for Substation & Outdoor Use

Engineered for harsh industrial environments, the Megger DLRO 200 is housed in a rugged, weather-resistant enclosure with IP54-rated protection when closed. Weighing under 15 kg (33 lbs), it provides heavy-duty substation testing power in a compact, portable package that one operator can easily carry to site.

Primary Applications

• High-Voltage Switchgear & Circuit Breakers: Measure main contact resistance (Ducter testing) according to ANSI/IEEE and IEC standards.

• Busbar Jointing & Splices: Verify proper torque, cleanliness, and conductivity across aluminum and copper busbar joints.

• Grounding & Bonding Systems: Test electrical grounding bonds, rail track joints, and aircraft structural bonding.

• Manufacturing Quality Assurance: Quality control testing for transformer windings, switch assemblies, and high-current electrical bus systems.

Technical Specifications

Upgrade Your High-Current Testing Capabilities Today

Ensure maximum reliability, regulatory compliance, and personnel safety across your electrical assets. Order your Megger DLRO 200 Digital Low Resistance Ohmmeter today or contact our technical sales team for custom lead sets and calibration options.